CO

Question 1

State auto actions for decreasing condenser vacuum

Answer 1

Normal: >27"
MPCS alarm: 27"
AR pump auto start: <26"
Steam Dump Block: 25"
Alarm: 24.9"
Turbine trip: 22.4"
MFP trip: 18.5"

Question 2

Discuss the Flow of air through the AR pump

Answer 2

At <2” HgV the inlet valve opens
<23” HgV the interstage check valve is closed
once at NOP (28” HgV) the exhaust is directed to the PAB

Question 3

State the CO pump start permissive

Answer 3

SCCW flow must be:
>26GPM to left nd right air cooler
>5 GPM to the bearing oil cooler

Question 4

State auto start of CO pump

Answer 4

CO start permissive must be satisfied
<250# MFP suction (1/2)
or any running CO pump trip

Question 5

When does the short term recirc valve open

Answer 5

> 490# CO pump discharge pressure

allows 2300 GPD flow

Question 6

Discuss exhaust hood spray

Answer 6

Starts to open at 140F, full open at 200

Turbine trip at 225F

Question 7

Discuss Long term recirc

Answer 7

6000 GPM per running pump after SPE back to hotwells

>330# for >10 seconds for valve to open

Question 8

Discuss CO-V-75

Answer 8

Opens when any other inlet or outlet in the 21 or 22 heaters go close.
Recloses by operator after all inlets and outlet are open

Question 9

State sources of steam for CO heaters

Answer 9

HTR - Stage
21 - 12th stage LP
22 - 11th stage LP
23 - 9th stage LP
24 - 8th Stage LP
25 - 7th Stage HP

Question 10

Discuss Hotwell level control Make up valve

Answer 10

Auto opens at -3”
Closes at 0”
Deenergizes at 233K CST level

Question 11

State Hot Well Level setpoints

Answer 11

\+9" MPCS High alarm
0" Normal water level
-3" Make-up valve opens, closes at 0"
-6" MPCS Low alarm
-12" MPCS Low-Low alarm